https://bugs.kde.org/show_bug.cgi?id=486072
[email protected] changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |[email protected] --- Comment #18 from [email protected] --- It started happening to me too, I believe it worked some weeks ago. I had HDR enabled, tried the brightness slider and it used software dimming. Found the new option for DDC/CI brightness, it was enabled, I tried with the options both disabled and enabled and it had no effect. Then I tried disabling HDR and the brightness slider stopped working. I set the brightness to half using "ddcutil setvcp 0x10 50" and it worked. Then I ran "ddcutil interrogate" and didn't understand much. After the two ddcutil commands I tried again with HDR disabled and it worked. I re-enabled HDR and it fell back to software dimming! But with "ddcutil setvcp 0x10 50" it correctly sets the monitor's brightness even with HDR enabled. Here's the ddcutil detect + system info, LMK if you need more or to use my system for live debugging. [The first is a DVI monitor connected via an HDMI adapter] Invalid display I2C bus: /dev/i2c-5 DRM connector: card1-HDMI-A-1 EDID synopsis: Mfg id: DEL - Dell Inc. Model: DELL P190S Product code: 16475 (0x405b) Serial number: P86NM22EA3NM Binary serial number: 1093881421 (0x41334e4d) Manufacture year: 2012, Week: 7 DDC communication failed Display 1 I2C bus: /dev/i2c-8 DRM connector: card1-DP-2 EDID synopsis: Mfg id: GSM - Goldstar Company Ltd (LG) Model: LG ULTRAGEAR Product code: 23629 (0x5c4d) Serial number: 305NTWG2Z969 Binary serial number: 101969 (0x00018e51) Manufacture year: 2023, Week: 5 VCP version: 2.1 Operating System: Arch Linux KDE Plasma Version: 6.4.2 KDE Frameworks Version: 6.16.0 Qt Version: 6.9.1 Kernel Version: 6.15.6-zen1-1-zen (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 3800XT 8-Core Processor Memory: 32 GiB of RAM (31.3 GiB usable) Graphics Processor: AMD Radeon RX 6750 XT Manufacturer: Micro-Star International Co., Ltd. Product Name: MS-7C94 System Version: 1.0 -- You are receiving this mail because: You are watching all bug changes.
